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67 lines
2.3 KiB
Bash
67 lines
2.3 KiB
Bash
#!/usr/bin/env bash
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# vim:ts=4:sts=4:sw=4:et
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#
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# Author: Hari Sekhon
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# Date: 2019-11-21 16:02:54 +0000 (Thu, 21 Nov 2019)
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#
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# https://github.com/harisekhon/bash-tools
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#
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# License: see accompanying Hari Sekhon LICENSE file
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#
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# If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
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#
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# https://www.linkedin.com/in/harisekhon
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#
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set -euo pipefail
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[ -n "${DEBUG:-}" ] && set -x
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usage(){
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cat <<EOF
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Waits and watches GCE Metadata API for the preemption trigger before continuing to execute its arguments
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Alternative to shutdown scripts or if you want to set up an interactive CLI latch on preemption
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https://cloud.google.com/compute/docs/shutdownscript
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Usage:
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${0##*/} "command1; command2; command 3" All commands execute in a subshell
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${0##*/}; command 1; command2; command 3 All commands execute in current shell
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(notice the semi-colon immediately after the script giving it no argument, merely using it as a latch mechanism)
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${0##*/} command1; command2; command 3 First command executes in the subshell (it's an argument). Commands 2 & 3 execute in the current shell after this script
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${0##*/} 'x=test; echo \$x' Variable is interpolated inside the single quotes at runtime after receiving Spot Termination notice
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Inspired by whenup() / whendown() for hosts and whendone() for processes from interactive bash library .bash.d/* sourced as part of the .bashrc in this repo
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For AWS there is a similar adjacent script aws_spot_when_terminated.sh
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EOF
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exit 3
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}
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if [[ "${1:-}" =~ -.* ]]; then
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usage
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fi
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#if ! curl -sS -H "Metadata-Flavor: Google" "http://metadata.google.internal/computeMetadata/v1/" &>/dev/null; then
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# echo "This script must be run from within a GCE instance as that is the only place the GCP GCE Metadata API is available"
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# exit 2
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#fi
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if output="$(curl -sS -H "Metadata-Flavor: Google" "http://metadata.google.internal/computeMetadata/v1/instance/preempted?wait_for_change=true")"; then
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if grep -q TRUE <<< "$output"; then
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eval "$@"
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else
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echo "not preempted, skipping commands"
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exit 1
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fi
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else
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echo "FAILED to query GCE Metadata API, not running inside GCE?"
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exit 2
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fi
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